Thanks Mathew.
Jubi
On Mon, Oct 22, 2012 at 2:42 PM, Matthew Gretton-Dann <
matthew.gretton-d...@linaro.org> wrote:
> On 20 October 2012 09:41, Jubi Taneja <jubitan...@gmail.com> wrote:
> > Hi Mathew
> >
> > On Tue, Oct 9, 2012 at 11:37 PM, Matthew Gretton-Dann
> > <matthew.gretton-d...@linaro.org> wrote:
> >>
> >> On 9 October 2012 14:44, Jubi Taneja <jubitan...@gmail.com> wrote:
> >> >
> >> >
> >> > On Tue, Oct 9, 2012 at 5:21 PM, Matthew Gretton-Dann
> >> > <matthew.gretton-d...@linaro.org> wrote:
> >> >>
> >> >> >> /* arm-none-linux-gnueabi-gcc -mcpu=cortex-a15 -mfpu=vfpv4 -S -o-
> >> >> >> /tmp/fma.c -mfloat-abi=hard -O2 */
> >> >> >> float f(float a, float b, float c)
> >> >> >> {
> >> >> >> return a * b + c;
> >> >> >> }
> >> >> >> /* end of tmp.c */
> >> >> >>
> >> >> >> (Note that -mfloat-abi=softfp will also work in this example.
> Which
> >> >> >> one you want to use depends on whether you have configured your
> >> >> >> system
> >> >> >> for hard or soft-float ABIs).
> >> >> >>
> >> >> > I checked both with -mfpu=vfpv3 and -mfpu=vfpv4 and it generates
> the
> >> >> > same
> >> >> > assembly code. VMLA insn is emitted for both the cases. I was
> >> >> > wondering
> >> >> > if I
> >> >> > can get any test case so that I may observe the difference in the
> two
> >> >> > objdumps.
> >> >>
> >> >> Which compiler are you using? VFMA support is only in trunk FSF GCC.
> >> >> Linaro has not yet backported support to 4.7.
> >> >
> >> >
> >> > I am using FSF GCC only.
> >>
> >> What version of GCC (what does arm-none-linux-gneabi-gcc -v report?).
> >
> > # arm-none-linux-gneabi-gcc -v
> > Using built-in specs.
> > COLLECT_GCC=arm-none-linux-gneabi-gcc
> >
> COLLECT_LTO_WRAPPER=/opt/toolchains/arm/bin/../libexec/gcc/arm-none-linux-gneabi/4.6.3/lto-wrapper
> > Target: arm-none-linux-gneabi
> > Configured with: /home/user/arm-src/build/sources/gcc_1/configure
> > --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu
> > --target=arm-none-linux-gneabi --prefix=/opt/arm
> > --with-sysroot=/opt/arm/arm-none-linux-gneabi/sys-root
> --disable-libmudflap
> > --disable-libssp --disable-libgomp --disable-nls --disable-libstdcxx-pch
> > --with-interwork --with-mode=arm --with-fpu=vfp3 --with-cpu=cortex-a9
> > --with-tune=cortex-a9 --with-float=softfp --enable-extra-vd-multilibs
> > --enable-poison-system-directories --enable-long-long --enable-threads
> > --enable-languages=c,c++ --enable-shared --enable-lto
> --enable-symvers=gnu
> > --enable-__cxa_atexit --with-pkgversion=arm-toolchain.v1 --with-gnu-as
> > --with-gnu-ld --with-host-libstdcxx='-static-libgcc
> > -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --with-build-time-tools=/opt/arm/bin
> > --with-gmp=/opt/arm --with-mpfr=/opt/arm --with-ppl=/opt/arm
> > --with-cloog=/opt/arm --with-libelf=/opt/arm
> > Thread model: posix
> > gcc version 4.6.3 (arm-toolchain.v1)
>
> This is gcc 4.6.3 not current trunk (which would report gcc version 4.8.0).
>
> GCC 4.6.3 does not support VFMA.
>
> Thanks,
>
> Matt
>
> --
> Matthew Gretton-Dann
> Linaro Toolchain Working Group
> matthew.gretton-d...@linaro.org
>
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